if __name__ == "__main__":
    ans = 0
    value_list = []

    context = open("in162.txt", "rt")
    for item in context:
        value_list = item.split(" ")
    context.close()

    for item in value_list:
        ans += float(item) * 0.454

    output = open("out162.txt", "wt")
    output.write("{:.2f}".format(ans))
    output.close()
